By referring to the underlying physics behind the color charge neutrality
condition in quark matter, we discuss how this condition should be properly
imposed in NJL-type models in a phenomenologically meaningful way. In
particular, we show that the standard assumption regarding the use of two color
chemical potentials, chosen in a very special way, is not justified in general.
When used uncritically, such an approach leads to wrong or unphysical
conclusions.Comment: 4 pages, no figure; v2: minor clarifications, references adde
